Phallostethidae

Phallostethidae, also known as priapium fish, is a family of atheriniform fish native to freshwater and brackish habitats in southeast Asia.

Gulaphallus is a genus of fishes in the family Phallostethidae, native to the Philippines. They are mainly found in freshwater habitats, but G. panayensis is from brackish and marine habitats. It is the only genus in the subfamily Gulaphallinae.